Hi.. Sorry i don't know any free service for unlock your samsung model. And in paid service means they give list of codes and you wand to find a perfect code for your mobile from that. So it will be risk. So try to unlock your mobile through paid service. It will be safe.
Wickedunlock.com is a service provider for unlocking mobile and here you can unlock your mobile at reliable cost by provide your mobile's IMEI number and country/Network it is locked to. And follow thier instructions, it'll be helpful to unlock your mobile.
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